Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
Slice the russet potato into thin, even wedges and pat them dry with a paper towel to ensure maximum crispiness.
Toss the potato wedges in a bowl with olive oil and a pinch of sea salt until well coated.
Spread the potatoes in a single layer on the baking sheet and roast for 20-25 minutes, flipping halfway through.
In a medium bowl, gently combine the lean ground beef with garlic powder, onion powder, sea salt, and black pepper.
Form the beef into a single thick patty, making a small indentation in the center to prevent bulging during cooking.
Heat a non-stick skillet over medium-high heat and sear the patty for 4-5 minutes per side until the internal temperature reaches 160°F.
During the last minute of cooking, place the halved whole wheat bun cut-side down in the pan to lightly toast.
Assemble the burger by spreading Dijon mustard on the bottom bun, followed by the lettuce, tomato slice, and beef patty.